Guided tours organized by the Direction des Espaces Verts et de l’Environnement (Parks and Gardens Department), details on www.paris.fr.
The École du Breuil is a school and is therefore closed to the public. However, it is possible to access the library on Monday, Wednesday and Friday from 9am to 5pm, on Tuesday from 1pm to 6pm and on Thursday from 9am to 6pm. The arboretum is free to access every day (see the website for opening hours).